Those red transit-only lanes whisking buses across The City apparently aren’t just for Muni.

Private commuter shuttles for the tech industry, hospital shuttles, casino buses and — potentially — even the private transit company Chariot may all use some of the soon-to-come red lanes on Geary Boulevard, a public records request by transit advocates has revealed.

That revelation is drawing public criticism of the newest red lanes up for approval at the San Francisco Municipal Transportation Agency Board of Directors Tuesday meeting, when the directors may approve parking changes to allow the Geary Rapid project, formerly known as Geary BRT, to move forward.

That $35 million project will see red transit-only lanes stretch down Geary Boulevard to allow the 38-Geary and 38R-Geary Rapid buses to shoot down the street separately from car traffic, speeding up the nearly 54,000 daily trips on those lines. The 38-Geary is the most trafficked bus line in the United States west of the Mississippi, according to the agency, with daily ridership nearly that of the entire Caltrain system.